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Message-ID: <41882E8F.6040608@free.fr>
Date: Wed, 03 Nov 2004 02:04:15 +0100
From: Remi Colinet <remi.colinet@free.fr>
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To: Ingo Molnar <mingo@elte.hu>
Cc: Florian Schmidt <mista.tapas@gmx.net>, Lee Revell <rlrevell@joe-job.com>,
       Paul Davis <paul@linuxaudiosystems.com>,
       Thomas Gleixner <tglx@linutronix.de>,
       LKML <linux-kernel@vger.kernel.org>, mark_h_johnson@raytheon.com,
       Bill Huey <bhuey@lnxw.com>, Adam Heath <doogie@debian.org>,
       Michal Schmidt <xschmi00@stud.feec.vutbr.cz>,
       Fernando Pablo Lopez-Lezcano <nando@ccrma.stanford.edu>,
       Karsten Wiese <annabellesgarden@yahoo.de>,
       jackit-devel <jackit-devel@lists.sourceforge.net>,
       Rui Nuno Capela <rncbc@rncbc.org>
Subject: Re: [Fwd: Re: [patch] Real-Time Preemption, -RT-2.6.9-mm1-V0.6]
References: <1099171567.1424.9.camel@krustophenia.net> <20041030233849.498fbb0f@mango.fruits.de> <20041031120721.GA19450@elte.hu> <20041031124828.GA22008@elte.hu> <1099227269.1459.45.camel@krustophenia.net> <20041031131318.GA23437@elte.hu> <20041031134016.GA24645@elte.hu> <20041031162059.1a3dd9eb@mango.fruits.de> <20041031165913.2d0ad21e@mango.fruits.de> <20041031200621.212ee044@mango.fruits.de> <20041101134235.GA18009@elte.hu> <41881B28.5010109@free.fr>
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Remi Colinet wrote:

> Ingo Molnar wrote:
>
>> i've uploaded a fixed kernel (-V0.6.8) to :
>>
>> http://redhat.com/~mingo/realtime-preempt/ 
>> <http://redhat.com/%7Emingo/realtime-preempt/>
>>

Without DEBUG_PAGE_ALLOC, the kernel (V0.6.9) is fairly stable.
I can even feel the difference of latency under KDE, between the stock 
kernel and V0.6.9. :-)

I like this patch.

Remi

> I have thousands of the following BUG with V0.6.9
>
> Nov 2 23:10:14 tigre02 kernel: printk: 6553 messages suppressed.
> Nov 2 23:10:14 tigre02 kernel: BUG: using smp_processor_id() in 
> preemptible [00000001] code: udev/1159
> Nov 2 23:10:14 tigre02 kernel: caller is store_stackinfo+0x5d/0xb0
> Nov 2 23:10:14 tigre02 kernel: [<c0106503>] dump_stack+0x23/0x30 (20)
> Nov 2 23:10:14 tigre02 kernel: [<c011f177>] smp_processor_id+0xb7/0xc0 
> (32)
> Nov 2 23:10:14 tigre02 kernel: [<c0159a5d>] store_stackinfo+0x5d/0xb0 
> (28)
> Nov 2 23:10:14 tigre02 kernel: [<c015b6ba>] 
> cache_free_debugcheck+0x1aa/0x390 (52)
> Nov 2 23:10:14 tigre02 kernel: [<c015c656>] kmem_cache_free+0x46/0xf0 
> (32)
> Nov 2 23:10:14 tigre02 kernel: [<c01731f1>] sys_open+0x81/0xb0 (32)
> Nov 2 23:10:14 tigre02 kernel: [<c0105561>] 
> sysenter_past_esp+0x52/0x71 (-8124)
> Nov 2 23:10:14 tigre02 kernel: ---------------------------
> Nov 2 23:10:14 tigre02 kernel: | preempt count: 00000002 ]
> Nov 2 23:10:14 tigre02 kernel: | 2-level deep critical section nesting:
> Nov 2 23:10:14 tigre02 kernel: ----------------------------------------
> Nov 2 23:10:14 tigre02 kernel: .. [<c011f11f>] .... 
> smp_processor_id+0x5f/0xc0
> Nov 2 23:10:14 tigre02 kernel: .....[<c0159a5d>] .. ( <= 
> store_stackinfo+0x5d/0xb0)
> Nov 2 23:10:14 tigre02 kernel: .. [<c014083d>] .... 
> print_traces+0x1d/0x60
> Nov 2 23:10:14 tigre02 kernel: .....[<c0106503>] .. ( <= 
> dump_stack+0x23/0x30)


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